Global Volcanism Program | Image GVP-06004
The 350-m-diameter Viti Crater (right center) and 14 other smaller craters were formed during 1724 at the start of a five-year period of rifting and eruptions known as the "Myvatn Fires." Krafla mountain (upper left), which appears in the background east of Viti and several smaller neighboring craters, is composed of hyaloclastic rocks formed during subglacial eruptions. It is one of the most prominent features in the Krafla caldera.
Photo by Michael Ryan, 1984 (U.S. Geological Survey).